Engineering, measured
RSS FeedEngineering notes on backend systems, performance and open source. Every post is built around measurements: what was measured, how, and what the numbers say, including the ideas that did not work. Each post links to its data and the scripts to reproduce it.
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json_encode() in php-src, autumn 2026: where the time goes and what is on the table
Five open pull requests, four compilers and two CPUs: what each change to json_encode()'s string escaping actually does, where it helps, where it hurts, and what is likely to land.